688 Bancroft. — A T ote on Vegetative Reproduction in 
but the anatomy was not found to be in any way unusual, the distribution 
of the vascular system being the same as in ordinary branching of the 
stem in monostelic forms . 1 
Text-fig. 2, A, B, and C, from a series of transverse sections through 
a tuber, shows the forking of the axis and the formation of the ventral 
rhizophore with its subtending ‘ axillary 5 leaf. The rhizophore is well 
developed and separates immediately after the branching of the axis 
(Text-fig. 2 , b). 
Text-fig. 3 shows one of a series of sections in which a small dorsal 
protuberance appears just before the dichotomy of the axis ; this is the 
undeveloped rudiment of the 
dorsal rhizophore . 2 A slender 
vascular trace is given off to- 
wards it immediately before the 
bifurcation of the stele (Text- 
fig. 3 ). Thus the order of ap- 
pearance of the vascular supplies 
at the bifurcation of the stem is 
as follows : dorsal rhizophore, 
branch, ventral rhizophore . 3 
The specimens of Selagi- 
nella chrysorrhizos exhibit a type 
of vegetative reproduction which 
is apparently typical for 5. 
bulbilifera. Hieronymus 4 re- 
marks that bulbil structures . have only been observed as a regular 
phenomenon in 5. bulbilifera, and are found both at the apices of cones 
and of vegetative branches, the latter sometimes becoming elongated and 
filamentous. They are small bulb-like organs of propagation which consist 
of a so-called ‘ lecus ’ or corm— a swelling of the apex of the shoot caused 
by hypertrophy of the cortical parenchyma. This tissue is filled with 
reserve materials, and the whole structure is closely surrounded by numerous 
crowded leaves, spirally developed and somewhat swollen at the base, but 
otherwise very similar to the early leaves of many species. The vegetative 
apex of the bulbils divides once or twice while these are still on the plant } 
in the same direction as dichotomies take place in the rest of the plant. 
Text-fig. 3. S. chrysocaulos : Diagrammatic trans- 
verse section of a * surface tuber \ just below the separa- 
tion of a branch, d., the dorsal rhizophore ; d.v.s., the 
vascular supply to the dorsal rhizophore ; br.v.s., the 
vascular supply to the branch. x 30. 
1 Cf. Harvey Gibson, R. J. : Contributions towards a Knowledge of the Anatomy of the Genus 
Selaginella, Pt. I, The Stem. Ann. of Bot., vol. viii, 1894, p. 133. 
2 Treub, M. : Recherches sur les organ es de la vegetation du Selaginella Marten sii , Spring, 
1877, p. 12. 
3 Harvey Gibson, 1. c., Fig. 53. This figure of Selaginella inaequalifolia shows the axillary 
leaf subtending the ventral rhizophore. It also shows that the dorsal rhizophore arises slightly 
before the ventral rhizophore. 
4 Hieronymus, 1. c., p. 666. 
